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Nuclear Theory·nucl-th

Tuesday·August 6, 2019

13 papers—6 primary·7 cross-listed

All13Primary6Cross-lists7
  1. 01

    Calculating n-Point Charge Correlations in Evolving Systems

    Scott Pratt🇺🇸

    In dynamic systems, charge susceptibilities and local charge correlations change with time. These changes are accompanied by non-local correlations which spread diffusively with time and are constrained by local charge conservation. Assuming the local features of the correlation, which for a gas would be the correlation of charges within the same particle, are equilibrated, a diagrammatic formalism is presented for calculating the evolution of the associated non-local correlations. These provide correlations of density operators at different positions for arbitrary . The techniques were developed with an eye towards relativistic heavy-ion collisions, and can account for correlations indexed by up, down and strange charges. Understanding the evolution of such correlations is crucial if one is to interpret measurements of charge fluctuations from the Relativistic Heavy-Ion Collider.

    nucl-thPRC(2020)·9 citations
  2. 02

    Isospin splitting of pion elliptic flow in relativistic heavy-ion collisions

    He Liu🇨🇳 · Feng-Tao Wang🇨🇳 · Kai-Jia Sun🇺🇸 · Jun Xu🇨🇳 · Che Ming Ko🇺🇸

    Based on the framework of an extended multiphase transport model with mean-field potentials in both the partonic phase and the hadronic phase, we explain the elliptic flow difference between and in the beam-energy scan program at the relativistic heavy-ion collider by incorporating the vector-isovector potential for quarks and antiquarks with different isospins. It is found that the isospin splitting of pion elliptic flow favors a strong vector-isovector interaction, and thus serves as a probe of the quark matter equation of state as well as the QCD phase structure at finite baryon and isospin chemical potentials.

    nucl-thhep-exnucl-exPLB(2019)·21 citations
  3. 03

    Backward nucleon production by heavy baryonic resonances in proton-nucleus collisions

    Oleksandra Panova🇺🇦 · Anton Motornenko🇩🇪 · Mark I. Gorenstein🇺🇦 · Jan Steinheimer🇩🇪 · Horst Stoecker🇩🇪

    The production of backward nucleons, , at in the nuclear target rest frame in proton-nucleus () collisions is studied. The backward nucleons appearing outside of the kinematically allowed range of proton-nucleon () reactions are shown to be due to secondary reactions of heavy baryonic resonances produced inside the nucleus. Baryonic resonances created in primary reactions can change their masses and momenta due to successive collisions with other nuclear nucleons. Two distinct mechanisms and kinematic restrictions are studied: the reaction and the resonance decay . Simulations of collisions using the Ultra-relativistic Quantum Molecular Dynamics model support these mechanisms and are consistent with available data on proton backward production.

    nucl-thhep-phPRC(2019)·5 citations
  4. 04

    Decay widths at the scission point in nuclear fission

    G.F. Bertsch · L.M. Robledo

    An outstanding problem in the theory of nuclear fission is understanding the Hamiltonian dynamics at the scission point. Here we apply the Generator Coordinate Method to calculate decay widths for pre-scission configurations into the two-fragment continuum. Transitions that are allowed under diabatic dynamics can have widths up to several MeV. For non-diabatic decays through the pairing interaction, typical widths to a specific final state channel are 2-3 orders of magnitude smaller. The nucleus U-236 is taken as a representative example in the calculations.

    nucl-thPRC(2019)·12 citations
  5. 05

    Jet charge in high energy nuclear collisions

    Shi-Yong Chen🇨🇳 · Ben-Wei Zhang🇨🇳 · En-Ke Wang🇨🇳

    Averaged jet charge characterizes the electric charge for the initiating parton, and provides a powerfull tool to distinguish quark jets from gluon jets. In this paper, we give the first prediction for the medium modification of averaged jet charge in heavy-ion collision at the LHC, where jet productions in p+p collisions are simulated by PYTHIA6, and parton energy loss in QGP are calculated with two Monte Carlo models of jet quenching: PYQUEN and JEWEL. We found that the distribution of averaged jet charge is significantly suppressed by initial state isospin effects due to the participants of neutrons with zero electric charge during nuclear collisions. Considerable enhancement of averaged jet charge in central Pb+Pb collisions relative to peripheral collisions is observed, since jet quenching effect is more pronounced in central collisions. Distinct feature of averaged jet charge between quark and gluon jets, together with the sensitivity of medium modifications on jet charge to flavor dependence of parton energy loss, could be very useful to discriminate the energy loss pattern between quark and gluon jets in heavy-ion collisions.

    nucl-thhep-phCPC(2020)·32 citations
  6. 06

    Electroweak Current Operators in Chiral Effective Field Theory

    Hermann Krebs🇩🇪

    In this proceeding I briefly review current status of the construction of nuclear electro-weak currents within chiral effective field theory. I show that gauge and chiral symmetry requirements lead to the well-known continuity equations for the current and charge operators which, however, get modified at higher orders. Regularization of the current will be also discussed. I demonstrate that implementation of a cutoff regulator in a naive way leads to violation of chiral symmetry. To respect the underlying symmetries I propose to use higher derivative regularization in the nuclear forces and currents.

    nucl-thhep-phPoS(2019)·14 citations

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first authorsco-authorsvia INSPIRE